Then bounce over to /etc/inittab and we have to comment out the last line by adding the # to the beginning.

#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

Step 2: Reboot with your Arduino plugged in and make sure you have the proper power.

Step 3: Download a serial terminal like minicom or cu. I like cu.

sudo apt-get install cu

Step 4: Figure out where your Arduino can be accessed. (Also make sure that you have already uploaded a script that is waiting for a serial connection.) Most likely as a Raspberry Pi user it will be ‘/dev/ttyACM0’ but to be sure I did a quick ‘ls -l /etc/serial/by-path’ and got the following answer: